| /* |
| * SAMSUNG EXYNOS USB HOST EHCI Controller |
| * |
| * Copyright (C) 2011 Samsung Electronics Co.Ltd |
| * Author: Jingoo Han <jg1.han@samsung.com> |
| * Author: Joonyoung Shim <jy0922.shim@samsung.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| * |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_gpio.h> |
| #include <linux/phy/phy.h> |
| #include <linux/platform_device.h> |
| #include <linux/usb.h> |
| #include <linux/usb/hcd.h> |
| |
| #include "ehci.h" |
| |
| #define DRIVER_DESC "EHCI EXYNOS driver" |
| |
| #define EHCI_INSNREG00(base) (base + 0x90) |
| #define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25) |
| #define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24) |
| #define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23) |
| #define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22) |
| #define EHCI_INSNREG00_ENABLE_DMA_BURST \ |
| (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \ |
| EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN) |
| |
| static const char hcd_name[] = "ehci-exynos"; |
| static struct hc_driver __read_mostly exynos_ehci_hc_driver; |
| |
| #define PHY_NUMBER 3 |
| |
| struct exynos_ehci_hcd { |
| struct clk *clk; |
| struct phy *phy[PHY_NUMBER]; |
| }; |
| |
| #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv) |
| |
| static int exynos_ehci_get_phy(struct device *dev, |
| struct exynos_ehci_hcd *exynos_ehci) |
| { |
| struct device_node *child; |
| struct phy *phy; |
| int phy_number; |
| int ret; |
| |
| /* Get PHYs for the controller */ |
| for_each_available_child_of_node(dev->of_node, child) { |
| ret = of_property_read_u32(child, "reg", &phy_number); |
| if (ret) { |
| dev_err(dev, "Failed to parse device tree\n"); |
| of_node_put(child); |
| return ret; |
| } |
| |
| if (phy_number >= PHY_NUMBER) { |
| dev_err(dev, "Invalid number of PHYs\n"); |
| of_node_put(child); |
| return -EINVAL; |
| } |
| |
| phy = devm_of_phy_get(dev, child, NULL); |
| exynos_ehci->phy[phy_number] = phy; |
| if (IS_ERR(phy)) { |
| ret = PTR_ERR(phy); |
| if (ret == -EPROBE_DEFER) { |
| return ret; |
| } else if (ret != -ENOSYS && ret != -ENODEV) { |
| dev_err(dev, |
| "Error retrieving usb2 phy: %d\n", ret); |
| return ret; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int exynos_ehci_phy_enable(struct device *dev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); |
| int i; |
| int ret = 0; |
| |
| for (i = 0; ret == 0 && i < PHY_NUMBER; i++) |
| if (!IS_ERR(exynos_ehci->phy[i])) |
| ret = phy_power_on(exynos_ehci->phy[i]); |
| if (ret) |
| for (i--; i >= 0; i--) |
| if (!IS_ERR(exynos_ehci->phy[i])) |
| phy_power_off(exynos_ehci->phy[i]); |
| |
| return ret; |
| } |
| |
| static void exynos_ehci_phy_disable(struct device *dev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); |
| int i; |
| |
| for (i = 0; i < PHY_NUMBER; i++) |
| if (!IS_ERR(exynos_ehci->phy[i])) |
| phy_power_off(exynos_ehci->phy[i]); |
| } |
| |
| static void exynos_setup_vbus_gpio(struct device *dev) |
| { |
| int err; |
| int gpio; |
| |
| if (!dev->of_node) |
| return; |
| |
| gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0); |
| if (!gpio_is_valid(gpio)) |
| return; |
| |
| err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH, |
| "ehci_vbus_gpio"); |
| if (err) |
| dev_err(dev, "can't request ehci vbus gpio %d", gpio); |
| } |
| |
| static int exynos_ehci_probe(struct platform_device *pdev) |
| { |
| struct exynos_ehci_hcd *exynos_ehci; |
| struct usb_hcd *hcd; |
| struct ehci_hcd *ehci; |
| struct resource *res; |
| int irq; |
| int err; |
| |
| /* |
| * Right now device-tree probed devices don't get dma_mask set. |
| * Since shared usb code relies on it, set it here for now. |
| * Once we move to full device tree support this will vanish off. |
| */ |
| err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
| if (err) |
| return err; |
| |
| exynos_setup_vbus_gpio(&pdev->dev); |
| |
| hcd = usb_create_hcd(&exynos_ehci_hc_driver, |
| &pdev->dev, dev_name(&pdev->dev)); |
| if (!hcd) { |
| dev_err(&pdev->dev, "Unable to create HCD\n"); |
| return -ENOMEM; |
| } |
| exynos_ehci = to_exynos_ehci(hcd); |
| |
| if (of_device_is_compatible(pdev->dev.of_node, |
| "samsung,exynos5440-ehci")) |
| goto skip_phy; |
| |
| err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci); |
| if (err) |
| goto fail_clk; |
| |
| skip_phy: |
| |
| exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost"); |
| |
| if (IS_ERR(exynos_ehci->clk)) { |
| dev_err(&pdev->dev, "Failed to get usbhost clock\n"); |
| err = PTR_ERR(exynos_ehci->clk); |
| goto fail_clk; |
| } |
| |
| err = clk_prepare_enable(exynos_ehci->clk); |
| if (err) |
| goto fail_clk; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(hcd->regs)) { |
| err = PTR_ERR(hcd->regs); |
| goto fail_io; |
| } |
| |
| hcd->rsrc_start = res->start; |
| hcd->rsrc_len = resource_size(res); |
| |
| irq = platform_get_irq(pdev, 0); |
| if (!irq) { |
| dev_err(&pdev->dev, "Failed to get IRQ\n"); |
| err = -ENODEV; |
| goto fail_io; |
| } |
| |
| err = exynos_ehci_phy_enable(&pdev->dev); |
| if (err) { |
| dev_err(&pdev->dev, "Failed to enable USB phy\n"); |
| goto fail_io; |
| } |
| |
| ehci = hcd_to_ehci(hcd); |
| ehci->caps = hcd->regs; |
| |
| /* DMA burst Enable */ |
| writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs)); |
| |
| err = usb_add_hcd(hcd, irq, IRQF_SHARED); |
| if (err) { |
| dev_err(&pdev->dev, "Failed to add USB HCD\n"); |
| goto fail_add_hcd; |
| } |
| device_wakeup_enable(hcd->self.controller); |
| |
| platform_set_drvdata(pdev, hcd); |
| |
| return 0; |
| |
| fail_add_hcd: |
| exynos_ehci_phy_disable(&pdev->dev); |
| fail_io: |
| clk_disable_unprepare(exynos_ehci->clk); |
| fail_clk: |
| usb_put_hcd(hcd); |
| return err; |
| } |
| |
| static int exynos_ehci_remove(struct platform_device *pdev) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); |
| |
| usb_remove_hcd(hcd); |
| |
| exynos_ehci_phy_disable(&pdev->dev); |
| |
| clk_disable_unprepare(exynos_ehci->clk); |
| |
| usb_put_hcd(hcd); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int exynos_ehci_suspend(struct device *dev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); |
| |
| bool do_wakeup = device_may_wakeup(dev); |
| int rc; |
| |
| rc = ehci_suspend(hcd, do_wakeup); |
| if (rc) |
| return rc; |
| |
| exynos_ehci_phy_disable(dev); |
| |
| clk_disable_unprepare(exynos_ehci->clk); |
| |
| return rc; |
| } |
| |
| static int exynos_ehci_resume(struct device *dev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); |
| int ret; |
| |
| clk_prepare_enable(exynos_ehci->clk); |
| |
| ret = exynos_ehci_phy_enable(dev); |
| if (ret) { |
| dev_err(dev, "Failed to enable USB phy\n"); |
| clk_disable_unprepare(exynos_ehci->clk); |
| return ret; |
| } |
| |
| /* DMA burst Enable */ |
| writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs)); |
| |
| ehci_resume(hcd, false); |
| return 0; |
| } |
| #else |
| #define exynos_ehci_suspend NULL |
| #define exynos_ehci_resume NULL |
| #endif |
| |
| static const struct dev_pm_ops exynos_ehci_pm_ops = { |
| .suspend = exynos_ehci_suspend, |
| .resume = exynos_ehci_resume, |
| }; |
| |
| #ifdef CONFIG_OF |
| static const struct of_device_id exynos_ehci_match[] = { |
| { .compatible = "samsung,exynos4210-ehci" }, |
| { .compatible = "samsung,exynos5440-ehci" }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, exynos_ehci_match); |
| #endif |
| |
| static struct platform_driver exynos_ehci_driver = { |
| .probe = exynos_ehci_probe, |
| .remove = exynos_ehci_remove, |
| .shutdown = usb_hcd_platform_shutdown, |
| .driver = { |
| .name = "exynos-ehci", |
| .owner = THIS_MODULE, |
| .pm = &exynos_ehci_pm_ops, |
| .of_match_table = of_match_ptr(exynos_ehci_match), |
| } |
| }; |
| static const struct ehci_driver_overrides exynos_overrides __initdata = { |
| .extra_priv_size = sizeof(struct exynos_ehci_hcd), |
| }; |
| |
| static int __init ehci_exynos_init(void) |
| { |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| pr_info("%s: " DRIVER_DESC "\n", hcd_name); |
| ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides); |
| return platform_driver_register(&exynos_ehci_driver); |
| } |
| module_init(ehci_exynos_init); |
| |
| static void __exit ehci_exynos_cleanup(void) |
| { |
| platform_driver_unregister(&exynos_ehci_driver); |
| } |
| module_exit(ehci_exynos_cleanup); |
| |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_ALIAS("platform:exynos-ehci"); |
| MODULE_AUTHOR("Jingoo Han"); |
| MODULE_AUTHOR("Joonyoung Shim"); |
| MODULE_LICENSE("GPL v2"); |